Solution-processed thin films of lead halide perovskites show exceptional optoelectronic properties, making them interesting candidates for a range of applications such as solar cells and light-emitting diodes. The thickness and crystallite-size in these films is typically in the sub-micron range, resulting in an abundance of grain-boundaries. Here we will describe techniques for growing thin single-crystalline lead perovskite crystallites with edge lengths of several tens of microns and thicknesses of around 1 micron, starting from single-source 1D lead halide perovskite precursors. We report our recent work of fabricating active electro-optical modulators (AEOM) from these crystals using focused-ion beam milling. These AEOMs exhibit > 98% light transmission intensity modulation with an applied external voltage of 45 V. In the final section of this talk we will report our recent efforts of growing single-crystalline mixed-halide lead perovskite platelets and demonstrate the visualization of photoinduced phase segregation in these materials.1 Upon illumination we observe the formation of iodide-rich domains throughout the entire crystal, demonstrating that light-induced phase segregation also occurs efficiently in absence of grain boundaries. Narrowband fluorescence imaging and time-resolved spectroscopy provided new insight into the nature of phase segregated domains and the collective impact on optoelectronic properties.

nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.

International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.

The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.

nanoGe Perovskite Conferences on Photovoltaics and Optoelectronics (NPERC) celebrated early every year is a combination of two independent events focused on perovskite research. The International Conference on Perovskite Thin Film Photovoltaics ABXPV is the best place to hear the latest on developments in all aspects perovskite solar cells, from fundamental physics and materials properties to a broad set of applications. The International Conference on Perovskite Photonics and Optoelectronics PEROPTO is focused on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.

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